To night wasn't practically exciting. Greg worked on
slotting holes for the ailerons while Rick and Gary made the wedge shaped
landing gear blocks and installed them. It don't sound like much but is
easier said than done. The wedge is cut both top to bottom and left to right
which will make the rear landing gear mounting on a plane totally parallel
to the fire walls. Once made we glued them in with 2-ton epoxy and called it
a night. We were afraid of disturbing the glue setting and positioning of
the part.
This week fellow B17 builder Hans Shull e-mail me. He had
the same problem with the nacelle side formers being short only he caught
the problem before he was glued together. He also stated we were "right
on" in beefing up the landing gear mounting area. At top gun he
saw another B17 which keep breaking the front mount. Once that was fixed the
rear mount broke and drove it through the top
of the
wing.
Last Saturday Rick and Greg run the motors some more and
tried the new poulan carb which we acquired. There was a problem and you can
read Greg's version right after I get finished here. We found a Walbro carb
which will fit our motor and have one on order.
Gary Himes
Now for Greg's report:
The new carburetor arrived from Carr-Precision. Rick and I
installed it on the engines. This carb has high and low speed adjustment
needles. We were able to get a consistent 6000 to 6100 RPM's out of the
engines with the stock mufflers. A slight improvement, however the best news
is in the idle. The idle speed dropped nearly 1000 RPM's to 1900 - 2000,
which is very good.
On a somewhat humorous side note of course it wasn't funny
at the time: Carr mentions the velocity stack will help improve performance.
So to try a down and dirty test of this, I removed the choke assembly from
the carb (won't need it anyway) and remounted the carb to one of the
engines. We started the engine. On throttle up, the engine suddenly made a
terrible sound and abruptly stopped. We checked the piston, which was
damaged, and discovered that when I removed the choke assembly, the
retaining spring for the choke went into the venturi, (I thought it dropped
in the grass). These engines obviously do not ingest springs very well.
Being a professional mechanic, Rick just shook his head and chuckled at my
horrified look. So off we went to get another engine, a 50 dollar oversight.
It is nice to know that after nearly 2 years on this project, we can still
laugh at each other without getting upset.
Greg Golden